The Vascular Pattern of Festucoid Grass Axes, with Particular Reference to Nodal Plexi

Hitch, P. Ann; Sharman, B. C.

doi:10.1086/336560

Cited by 46 publications

(18 citation statements)

References 7 publications

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“…Figure 4A is a schematic diagram of a longitudinal section of an Avena stem segment as used in our experiments. The anatomical parts are labeled in this figure3 according to presently accepted nomenclature (4). The basal stippled region, which contains a plexus of vascular elements (4), is the area most strongly stained red by phloroglucinol, although certain parts of the joint and sheath are also stained positively.…”

Section: Resultsmentioning

confidence: 99%

“…The anatomical parts are labeled in this figure3 according to presently accepted nomenclature (4). The basal stippled region, which contains a plexus of vascular elements (4), is the area most strongly stained red by phloroglucinol, although certain parts of the joint and sheath are also stained positively. This is due to the 2 The term "node" has been used somewhat loosely in our earlier publications (1,11) to include both the "node" and the "joint" in Figure 4A.…”

Section: Resultsmentioning

confidence: 99%

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On the Nature of the Physiological Responses of Avena Stem Segments to Gibberellic Acid Treatment

Montague

Ikuma²,

Kaufman³

1973

Plant Physiol.

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Gibberellic acid was found to cause elongation in Avena sativa (oat) stem segments whether it was applied continuously or as a short pulse. The shorter the pulse time became, the higher was the gibberellic acid concentration needed to cause elongation; the segmental growth apparently depends upon the amount of gibberellic acid taken up by the segments. Avena segments showed a decreased growth response to gibberellic acid if the treatments were initiated at increasingly later times after excision from the plant. This decreased responsiveness to gibberellic acid was inhibited by low temperature (0-4 C), but accelerated by anaerobiosis. On the other hand, growth stimulation by a gibberellic acid pulse at the start of incubation was not altered by cold treatment but was nullified by a nitrogen atmosphere. Both the readiness of the segments for growth stimulation by gibberellic acid and its action in promoting growth clearly involve temperature-dependent, aerobic metabolism.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

On the Nature of the Physiological Responses of Avena Stem Segments to Gibberellic Acid Treatment

Montague

Ikuma²,

Kaufman³

1973

Plant Physiol.

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“…The polystele of monocotyledonous stems prevents ice propagation via the vascular system into other leaves. Leaf vascular bundles do not end blindly in the stem, but are usually linked with strands of older leaves via nodal plexus branches (Esau, 1965;Hitch and Sharman, 1971;Shane et al, 2000). Although this linkage allows the conduit of water, ice propagation seems to be blocked.…”

Section: Ice Propagation and Freezing Patternsmentioning

confidence: 99%

Ice Propagation in Dehardened Alpine Plant Species Studied by Infrared Differential Thermal Analysis (IDTA)

Hacker

Neuner

2008

Arctic, Antarctic, and Alpine Research

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“…Richter (15) has pointed out that the potential of a covered, nontranspiring leaf or twig will equilibrate to the potential at the point of bifurcation. The last bifurcation point for xylem vessels from sorghum leaves may be at the node of attachment or many nodes below this, since leaf vascular connections have been observed to be continuous through eight internodes below the node of attachment (9,18). This being so, each leaf on the short statured plants used in these experiments may have had some direct xylem connection with the nodal plexus of the crown.…”

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confidence: 92%

Resistance to Water Flow in the Sorghum Plant

Meyer¹,

Ritchie²

1980

Plant Physiol.

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Knowledge of the location and magnitude of the resistance to water flow in a plant is fn tal for describing whole plant response to water stress. The reported magnitudes of these resistances vary widely, principally because of the difficulty of measuring water potential within the plant. A Assuming that the covered leaf water potentidal was equal to that in the root xylem at the point of water absorpton in the experimental plants with relatively short root axes, calculated radial root resistances were strongly dependent on the transpiration rate. For plants with moderate to high transpiration rates the roots had a slghtiy larger resistance than the shoots.The passive movement of water through a plant is driven by gradients in the chemical potential of water. The relationship between water flow and potential (usually expressed as a resistance) at various points in the plant is not generally understood. Early work (10) suggested that the root system was the major resistance to water flow into and through the plant. Boyer (4) showed for sunflower and bean that the resistance to water flow was nearly as large in the leaf and stem as in the root. Further observations (1) on tobacco indicate a considerable drop in potential between an exposed leaf and the potential of a nontranspiring covered leaf. Relatively little work has been done to quantify the resistances to water flow in monocotyledons. Neumann et aL (13) Solution Culture. Eight Captan-treated seeds and 20 ml of complete nutrient solution were placed in a Dispo3 growth pouch.Pouches were suspended through slots in the top of an enclosed box so that roots would develop under low light conditions. The box was located in a controlled temperature greenhouse. Germination began within 2 days. Nongerminated seeds were discarded on the 3rd day. Within 7 days seminal roots had reached the bottom of the pouch. Individual seedlings were then wrapped in a foam strip (120 x 20 x 5 mm) and pushed through a 20-mmdiameter hole in 20-mm-thick styrofoam sheeting.

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The Vascular Pattern of Festucoid Grass Axes, with Particular Reference to Nodal Plexi

Cited by 46 publications

References 7 publications

On the Nature of the Physiological Responses of Avena Stem Segments to Gibberellic Acid Treatment

On the Nature of the Physiological Responses of Avena Stem Segments to Gibberellic Acid Treatment

Ice Propagation in Dehardened Alpine Plant Species Studied by Infrared Differential Thermal Analysis (IDTA)

Resistance to Water Flow in the Sorghum Plant

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